Ham & Cheese Christmas Tree Pastry - Fun Holiday Appetizer - My Homemade Recipe

Ingredients

• 2 sheets puff pastry (320g each).
• 1 tablespoon Dijon mustard.
• 12 slices wafer thin ham.
• 150g cheddar cheese, finely grated.
• 1 egg, beaten.
• Grated parmesan for serving.
• 1 tablespoon butter (for sauce).
• 1 tablespoon plain flour (for sauce).
• 240ml milk (for sauce).
• 60g gruyere cheese, grated (for sauce).
• ⅛ teaspoon each salt, white pepper, nutmeg (for sauce).